#include<stdio.h>
#include<stdlib.h>
#include<string.h>


int main(int argc, int *argv[])
{
    char *ptr="hello world";

    char src[100]="hello world";

    char *str=(char *)malloc(sizeof(char)*100);
    if(NULL==str)
    {
        printf("malloc error!\n");
        exit(1);
    }

    return 0;
}